So far I have purchased from vmart.pk, shophive.com, daraz.pk and lootlo.pk.
daraz.pk customer service is excellent
vmart.pk also delivers genuine products within time and has good customer service
shophive.com is also relaible
lootlo.pk is ok, but they sell mediocre quality products and have long processing times
mega.pk is also good and reliable, but not as good as vmart